Cu-12％Al铝青铜线材的连续定向凝固制备

PREPARATION OF Cu-12%Al ALBRONZE WIRES BY CONTINUOUS UNIDIRECTIONAL SOLIDIFICATION

采用真空熔炼、氩气保护下拉式连续定向凝固方法制备了Cu-12％Al(质量分数)合金线材,研究了工艺参数对凝固成形过程的影响,分析了连续定向凝固线材的组织性能．结果表明:当熔体温度1250℃、下拉速度9 mm／min、冷却水量900 L／h时,可以连续稳定成形直径6 mm、表面较光滑、具有单晶组织的Cu-12％Al合金线材,其延伸率达到19．7％,弹性模量达到167．9 GPa,电导率达到22．23％(IACS),具有优良的综合性能．

Cu-12%Al alloy （mass fraction） wires were prepared by vacuum melting and argonshield vertical continuous unidirectional solidification process. Effects of process parameters on the solidification forming were investigated, and the microstructure and properties of the wires were analyzed. The results showed that Cu-12%Al wires with 6 mm in diameter, smooth surface and single crystal structure can be continuously and stably fabricated under melting temperature 1250 ℃, drawing speed 9 mm/min and cooling water flow rate 900 L/h. The Cu-12%Al wire shows an excellent combination property, elongation 19.7V0, elastic modulus 167.9 GPa and conductivity 22.23% （IACS）.